Question Number 106386 by Ar Brandon last updated on 04/Aug/20
$$\mathrm{Is}\:\mathrm{there}\:\mathrm{a}\:\mathrm{formula}\:\mathrm{to}\:\mathrm{calculate}; \\ $$$$\underset{\mathrm{k}=\mathrm{1}} {\overset{\mathrm{n}} {\prod}}\mathrm{U}_{\mathrm{k}} \:\:? \\ $$